Executive Summary

• METLEN has signed a Balance of Plant contract with Pulse Clean Energy for a 129MW BESS project in the West Midlands – the largest project to date in the UK in terms of storage capacity
• Across the UK, METLEN has delivered or is currently working on approximately 30 battery storage units, including hybrid or collocated solar and battery, representing nearly 2GWh of energy storage capacity
• The new projects, including those in Italy and Greece, ‘demonstrate METLEN’s view of battery storage not as a complementary technology, but as a critical enabler of the energy transition’, the company noted

METLEN has signed a BoP (Balance of Plant) contract with Pulse Clean Energy in the UK for the 129MW Penn BESS project in the West Midlands, as part of a wider strengthening of M RESET, its platform which manages large-scale battery storage.

The move for Penn, which has an installed battery capacity of 362MWh, is the largest energy storage project the company has undertaken in the UK to date in terms of storage capacity.

The company is also making moves in Italy and its home country of Greece, with the former involving an €18 million long-term financing agreement secured for a 25MW / 75MWh BESS project, and the latter involving multiple projects, including the largest standalone battery system in Greece at 330MW / 790 MWh.

Across the UK, METLEN has delivered or is currently working on approximately 30 battery storage units, including hybrid or collocated solar and battery, representing nearly 2GWh of energy storage capacity. One such project announced earlier this year was the Bumble Bee Co-Located Renewable Energy Project in Nottinghamshire with Cero Generation, integrating generation and storage within a single hybrid configuration.

“Together, these projects demonstrate METLEN’s view of battery storage not as a complementary technology, but as a critical enabler of the energy transition,” the company wrote. “It supports renewable energy integration, provides grid flexibility and stabilisation services, strengthens energy security, reduces curtailment and helps create a more resilient and reliable power system.”

In March, METLEN announced with Greek utility PPC an equally-owned joint venture for two-hour liquid-cooled battery systems across Romania, Bulgaria and Italy, with a total nominal capacity of up to 1,500 MW / 3,000 MWh. The systems utilise LFP (lithium iron phosphate) technology to maximise both usable energy output and operational safety.

While Italy, along with Britain and Germany, are traditional leaders in European battery markets, Aurora Energy Research cited both Bulgaria and Romania as new entrants in its analysis of most attractive markets earlier this year. The analyst observed ‘promising battery economics and increased policy support’ in the two countries.

Picture credit: METLEN